I'm not a physicist and this sounds like a fun finding. What are the minimum properties that constitute an effective "barrier" to jump? Would a single atom se

I'm not a physicist and this sounds like a fun finding. What are the minimum properties that constitute an effective "barrier" to jump? Would a single atom serve as a barrier to jump? Could we set up a particle accelerator that is just a circle of single atoms to jump, at faster than the speed of light?